Secondary-battery current collector, secondary-battery cathode, secondary-battery anode, secondary battery and production method thereof

• US 8,663,845 B2
• Filed: 02/10/2006
• Issued: 03/04/2014
• Est. Priority Date: 02/10/2005
• Status: Active Grant

• Current Assignee: Shohoku Laminate Co., Ltd.
• Original Assignee: Showa Denko KK (Resonac Holdings Corp.)
• Inventors: Ohmori, Masahiro
• Primary Examiner(s): SAHA, BIJAY S
• Application Number:
  US11/816,035
• Publication Number:
  US 20090029255A1
• Time in Patent Office: 2,944 Days
• Field of Search: None
• US Class Current: 429/231.1
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 4/0404 by coating on electrode collectors
• CPC Class Codes: H01M 4/1391 of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/625 Carbon or graphite
• CPC Class Codes: H01M 4/661 Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: H01M 4/667 in the form of layers, e.g. coatings
• CPC Class Codes: H01M 4/80 Porous plates, e.g. sintered carriers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A secondary-battery current collector comprising an aluminum foil and a film containing an ion-permeable compound and carbon fine particles formed thereon or a secondary-battery current collector comprising an aluminum foil, a film containing an ion-permeable compound and carbon fine particles formed thereon as the lower layer, and a film containing a binder, carbon fine particles and a cathodic electroactive material formed thereon as the upper layer, a production method of the same, and a secondary battery having the current collector are provided.

Claims

1. A secondary-battery cathode comprising:

a current collector comprising a foil and a conductive film adhered on a surface of the foil; and

a cathodic electroactive film adhered on a surface of the conductive film of the current collector and comprising a binder, carbon fine particles and a cathodic electroactive material,

wherein the foil comprises one of aluminum and copper and has a thickness which is in a range of more than 5 μ

m and 100 μ

m or less, the conductive film has a thickness which is in a range of 0.1 μ

m or more and 10 μ

m or less, the conductive film comprises an ion-permeable compound and carbon fine articles, the ion-permeable compound comprises a cross-linked polysaccharide which is a polysaccharide polymer cross-linked with a cross-linking agent, the conductive film is formed to electrically connect the foil and a cathodic electroactive film in a secondary battery and has the carbon fine particles in an amount sufficient to provide conduction of electrons in the conductive film positioned between the foil and the cathodic electroactive film in the secondary battery, and the carbon fine particles have particle sizes in a range of 10 nm to 100 nm, wherein the cross-linking agent comprises at least one selected from the group consisting of acrylamide, acrylonitrile, chitosan pyrrolidone carboxylate salt, hydroxypropylchitosan, phthalic anhydride, maleic anhydride, trimellitic anhydride, and pyromellitic anhydride.

5. A method of producing a secondary battery, comprising:

impregnating a layer which comprises the cathode as recited in claim 1, a separator formed on the cathode and an anode formed on the separator with an organic electrolyte solution.

6. A secondary battery comprising:

a layer which comprises the cathode as recited in claim 1, a separator formed on the cathode and an anode formed on the separator,

wherein the layer is impregnated with an organic electrolyte solution.

2. A secondary-battery anode comprising:

a current collector comprising a foil and a conductive film adhered on a surface of the foil; and

an anodic electroactive film adhered on a surface of the conductive film of the current collector and comprising a binder, carbon fine particles and an anodic electroactive material,

wherein the foil comprises one of aluminum and copper and has a thickness which is in a range of more than 5 μ

m and 100 μ

m or less, the conductive film has a thickness which is in a range of 0.1 μ

m or more and 10 μ

m or less, the conductive film comprises an ion-permeable compound and carbon fine particles, the ion-permeable compound comprises a cross-linked polysaccharide which is a polysaccharide polymer cross-linked with a cross-linking agent, the conductive film is formed to electrically connect the foil and an anodic electroactive film in a secondary battery and has the carbon fine particles in an amount sufficient to provide conduction of electrons in the conductive film positioned between the foil and the anodic electroactive film in the secondary battery, and the carbon fine particles have particle sizes in a range of 10 nm to 100 nm, wherein the cross-linking agent comprises at least one selected from the group consisting of acrylamide, acrylonitrile, chitosan pyrrolidone carboxylate salt, hydroxypropylchitosan, phthalic anhydride, maleic anhydride, trimellitic anhydride, and pyromellitic anhydride.

7. A method of producing a secondary battery, comprising:

impregnating a layer which comprises a cathode, a separator formed on the cathode and the anode as recited in claim 2 formed on the separator with an organic electrolyte solution.

8. A secondary battery comprising:

a layer which comprises a cathode, a separator formed on the cathode, and the anode as recited in claim 2 formed on the separator,

wherein the layer is impregnated with an organic electrolyte solution.

3. A method of producing a secondary-battery cathode, comprising:

forming a current collector comprising a foil and a conductive film adhered on a surface of the foil; and

coating a dispersion of a binder, carbon fine particles and a cathodic electroactive material in a solvent on a surface of the conductive film of the current collector such that a cathodic electroactive film comprising the binder, carbon fine particles and cathodic electroactive material is adhered on the surface of the conductive film,

wherein the foil comprises one of aluminum and copper and has a thickness which is in a range of more than 5 μ

m and 100 μ

m or less, the conductive film has a thickness which is in a range of 0.1 μ

m or more and 10 μ

m or less, the conductive film comprises an ion-permeable compound and carbon fine particles, the ion-permeable compound comprises a cross-linked polysaccharide which is a polysaccharide polymer cross-linked with a cross-linking agent, the conductive film is formed to electrically connect the foil and a cathodic electroactive film in a secondary battery and has the carbon fine particles in an amount sufficient to provide conduction of electrons in the conductive film positioned between the foil and the cathodic electroactive film in the secondary battery, and the carbon fine particles have particle sizes in a range of 10 nm to 100 nm, wherein the cross-linking agent comprises at least one selected from the group consisting of acrylamide, acrylonitrile, chitosan pyrrolidone carboxylate salt, hydroxypropylchitosan, phthalic anhydride, maleic anhydride, trimellitic anhydride, and pyromellitic anhydride.

4. A method of producing a secondary-battery anode, comprising:

forming a current collector comprising a foil and a conductive film adhered on a surface of the foil; and

coating a dispersion of a binder, carbon fine particles and an anodic electroactive material in a solvent on a surface of the conductive film of the current collector such that an anodic electroactive film comprising the binder, carbon fine particles and anodic electroactive material is adhered on the surface of the conductive film,

wherein the foil comprises one of aluminum and copper and has a thickness which is in a range of more than 5 μ

m and 100 μ

m or less, the conductive film has a thickness which is in a range of 0.1 μ

m or more and 10 μ

m or less, the conductive film comprises an ion-permeable compound and carbon fine articles the ion-permeable compound comprises a cross-linked polysaccharide which is a polysaccharide polymer cross-linked with a cross-linking agent, the conductive film is formed to electrically connect the foil and an anodic electroactive film in a secondary battery and has the carbon fine particles in an amount sufficient to provide conduction of electrons in the conductive film positioned between the foil and the anodic electroactive film in the secondary battery, and the carbon fine particles have particle sizes in a range of 10 nm to 100 nm, wherein the cross-linking agent comprises at least one selected from the group consisting of acrylamide, acrylonitrile, chitosan pyrrolidone carboxylate salt, hydroxypropylchitosan, phthalic anhydride, maleic anhydride, trimellitic anhydride, and pyromellitic anhydride.